单选题
5.
Since his wife died, he has ______ himself into the research work.
A、
devoted
B、
dedicated
C、
thrown
D、
contributed
【正确答案】
C
【答案解析】
A．devote sb./ oneself/ time/ energy/ all to doing sth. 奉献……去做……(介词为to)；B．dedicate...to...捐献…，去做…．(介词为to)；C．throw sb./ sth. Into doing sth. 使某人投身于做某事上；D．contribute(...)to...贡献…去做…
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